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使用差距罕见的多重序列对齐改进了哺乳动物家族系谱:现存的胎盘和有袋动物的时间树
Gao-Ming Liu1, Qi Pan1,2, Juan Du1,2
1Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.
Zoological research
|November 1, 2023
概括
哺乳动物的多样化开始在白纪-古生物学期灭绝之前. 灭绝后的生态机会推动了快速的胎盘和 marsupial 辐射,塑造了现代哺乳动物的多样性.
科学领域:
- 进化生物学 进化生物学
- 古生物学的古生物学
- 基因组学就是基因组学.
背景情况:
- 哺乳动物多样化的时间相对于白纪-旧世 (KPg) 大规模灭绝是有争议的.
- 之前的研究在分类学范围或数据分辨率方面遇到了局限.
研究的目的:
- 解决哺乳动物类型的矛盾关系.
- 使用改进的数据集和植物遗传学方法,准确地确定哺乳动物多样化事件的日期.
主要方法:
- 增强了现有的哺乳动物基因组数据集,并生成了一个新的数据集,包含120个类型和98个外来标记.
- 使用分子时钟模型和化石校准构建了族系和时间树.
主要成果:
- 胎盘哺乳动物的顺序间多样化在白纪晚期之前开始.
- 在KPg边界之后,胎盘和袋鼠血统的内部多样化加速.
- 支持一个延伸到白纪晚期至古世的胎盘辐射场景.
结论:
- 哺乳动物的多样化受到灭绝前和灭绝后的进化动态的影响.
- 在KPg后,生态的可用性促进了哺乳动物的快速辐射.
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